1+ 0.9 +0.09+ 0.009……=?
? Is it 2?
There are ***6 answers for writing answers.
Not bitter gourd, but high energy.
If you don't understand anything, just ask me.
watch out for
Let it be 0.9+0.09+0.009+ ... = X.
10x=9+0.9+0.09+0.009+……
10x-x =(9+0.9+0.09+0.009+……)(0.9+0.09+0.009+……),
9x=9,
x= 1,
So1+0.9+0.09+0.009+... =1+1= 2.
Extended data
The types of equations are divided according to different numbers of unknowns, different powers of unknowns and different numbers and powers of unknowns.
According to the number of unknowns, it is divided into one-dimensional equation, two-dimensional equation and multivariate equation;
According to the power of the unknown, it can be divided into linear equation, quadratic equation and multivariate equation.
According to the number and power of the unknown, it can be divided into binary linear equation, binary quadratic equation, binary multivariate equation and multivariate multivariate equation.
0 appreciation 3
Zhang Guofen 3399
2020- 12- 1 1
watch out for
I think so: the cycle of 0.9+0.09+0.009+…=9, the cycle of 9 is equal to 1, so the cycle of 1+9 is equal to1= 2.
0 4
Anonymous user
20 17- 12-29
Solution 1:
1+0.9+0.09+0.009+……= 1+0.9×( 1-0. 1^n)/( 1-0. 1)=2-0. 1^n,
When n→∞, the original formula =2.
Solution 2:
Let 0.9+0.09+0.009+ ... = x,
10x=9+0.9+0.09+0.009+……,
10x-x =(9+0.9+0.09+0.009+……)(0.9+0.09+0.009+……),
9x=9,
x= 1,
So1+0.9+0.09+0.009+... =1+1= 2.
Expand the remaining 8%
0 16
Southwest wind of AQ
20 17- 12-28 TA received more than 29,000 likes.
watch out for
Original formula = 1.999...= 2.
0 67
Tea in the rain 886
20 17- 12-28 TA received more than 70 1 likes.
watch out for
If you use extreme thinking, it is 2.
0 3
1 answers are folded (why? )
In the first calculation of mathematical problems, the teaching and research team of 10000 people accurately controls the proposition trend.
This month, 8 188 people have applied for related services.
consult
Advertisement of Shanghai Zhangxiaomen Education Technology Co., Ltd.
"Taobao"-brand convergence, Taobao I like!
Taobao value-added goods, excellent quality, surprise price, flagship goods, Amoy you satisfied! On Taobao, surprises can be seen everywhere!
Taobao.com advertisement
Live blind box special shot link surprise, value for money, nine dollars and nine packages.
8,000 people downloaded it this month.
9.9 yuan 10.9 yuan
buy
Pinduoduo advertisement
Recommend for you
1+0.9+0.09+0.009 ...= 2?
That's right. The analysis process is as follows:1+0.9+0.09+0.009 ... =1+(0.9+0.09+0.0
1 1 browse 1953 20 19-03-25
1+0.9+0.09+0.009=( )
1.999
Browse 4
1+0.9+0.09+0.009+……=( )
1.9999……
23 browse 1025
1+0.9+0.09+0.009+...= () There must be a process.
If this question equals two, then I didn't learn anything in college.
1 browse 838
1+0.9+0.09+0.009+0.0009+What is it ...
2+0.9+0.09+0.009+0.0009+0.00009+.......=2+0.9999
1 Browse2022019-12-23
Failed to cut double eyelids-Hefei Yixing double eyelids-click to view the comparison before and after.
Case effect
Project introduction
Price cost
Consultation appointment
This month, 2 17 people have consulted related questions.
consult
Hefei Yixing Medical Beauty Hospital Co., Ltd.
Mathematical thinking training in primary schools _ Improving children's logical thinking ability
This month, 767 people have applied for related services.
Advertisement of Shanghai Zhangxiaomen Education Technology Co., Ltd.
load cargo
Ask questions to netizens
138 * * *19 knows to quit the feedback complaint.
Computer version? 202 1 Baidu
Jing ICP Zheng 030 173-1 Wen 20 130934-983
First of all, if all off-campus training institutions disappear, the impac